Of the three, I like the composition of the third one the best... the legs provide a natural guide down to her head/face with great use of depth of field. The problem with the third one is the lack of color saturation... it looks almost washed out when compared to your first one... not so much compared to the second one. But, I'm a sucker for nice warm sensual images like your first though it might have just a tad too much yellow.. hard to tell exactly on this laptop, but it's color is pretty true. Also, on the first image, I sure would like to know what she finds so interesting up there! The lack of eye contact is distracting.

The second image's tilt bothers me. Don't see a reason for it other than to fit her into the rectangular box of the image. Nice colors, though.

Looks like y'all had fun, though!

This is Amber, to satisfy the 'ya gotta post an image to critique someone else's image' rule...